MODE-1944 Migrated ModeShape EAP kit to EAP 6.1.0.GA. 

This presented a number of challenges:

- RestEASY 2.3.6 excludes explicitly a dependency required by `resteasy-multipart-provider/apache.james`. For this to work, it had to be re-added with the scope "runtime"
- Deploying exploded webapps does not work anymore (for whatever reason...). This means that our EAP kit had to be changed to provide packaged .war files for the web application. This brought forth several issues around the subsystem and the content of the wars which were fixed.

Before testing this, make sure you run the `install-eap` script on the downloaded EAP 6.1.0.GA zip.